Inheritance

Inheritance

1. Functions by extending a class

   • Parent Class
     • Represents the characteristics common to all child classes
     • Has methods common to all child classes
     • Has attributes common to child classes
   • Child Class
     • Represents specific characteristics to each child class
     • super();
       • Initializes an instance of the direct superclass of the current object
       • Must be the first statement in the constructor
       • Can also be used to call a hidden member or an overridden method
     • Override
       • Changes the behavior of a method in the parent class
       • If the method has the same name, but the arguments differ, it's considered overloading
   • Final prevents a class from being extended

2. Keywords:

   • 'extends' to actually attribute a subclass to another class
   • 'final' to prevent the class from being extended
   • 'instanceof' to test if an object is of a specified type

3. Overrides

   • When you change the functionality of a method in the parent class

4. Type Casting

   • Down Casting
   • Up Casting